Sergio Macedo
@sergiomacedo
Full-stack engineer delivering secure fintech features end-to-end with React.js and Node.js.
BrazilWhat I'm looking for
I’m a Full Stack Engineer who builds, tests, and deploys features end-to-end with React.js and Node.js, with a strong focus on clean architecture and maintainable systems. I bring solid foundations in object-oriented programming, data structures, and software architecture, and I enjoy walking teammates through technical decisions while staying collaborative and communicative.
In fintech-focused work, I’ve delivered security, privacy, and compliance capabilities such as RBAC, LGPD-aligned data minimization, OWASP best practices, authentication/authorization, and audit logging. At JobModel, I developed full-stack payments and integrations (including HMAC webhooks), modeled a PostgreSQL layer with 75+ entities, and supported production ETL migration of ~998k records with extensive automated coverage (including 206 automated tests and DB-backed E2E).
Across roles and projects, I’ve consistently shipped reliable product features—building and integrating RESTful APIs, React/Next.js UIs, and Node-based services (including NestJS/Express and event-driven patterns). I also use AI-assisted development daily (GitHub Copilot, Cursor, Claude, ChatGPT) while rigorously reviewing generated code for security, efficiency, and accuracy.
Experience
Work history, roles, and key accomplishments
Full Stack Engineer
JobModel
Oct 2025 - Present (10 months)
Develop, test, and deploy end-to-end full-stack features using React.js and Node.js (NestJS) in a monorepo, including RESTful API integration and a PostgreSQL data layer with production ETL. Implemented authentication, RBAC, and OWASP-aligned security (including audit logging) and used AI-assisted development while performing rigorous security-focused code reviews.
Full Stack Developer
Onda Segura
Oct 2024 - Sep 2025 (11 months)
Built and shipped full stack contract-management applications using React/Next.js and Node.js/Express, including responsive mobile-first UI and REST API integration. Implemented authentication and RBAC, troubleshot and upgraded existing software, and integrated payment providers for billing automation.
Developer Intern
Mobilitude
Sep 2023 - Oct 2024 (1 year 1 month)
Built full stack features including a REST API with a WebSocket backend and a Next.js/React frontend for AI-driven vehicle detection. Developed desktop automation for vehicle image analysis and improved report generation speed through pipeline optimization.
Education
Degrees, certifications, and relevant coursework
FTR (Fundação RocketSeat)
MBA, Full Stack Development
Postgraduate MBA in Full Stack Development (online) from Fundação RocketSeat.
IFSC
Bachelor's degree, Electrical Engineering
Bachelor's degree in Electrical Engineering from IFSC in Itajaí, Santa Catarina.
Tech stack
Software and tools used professionally
Availability
Location
BrazilAuthorized to work in
Job categories
Skills
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